The way of saving player data has changed. It now saves everyone's data in separate files, so you can easily find and edit their file without using CTRL + F to find a specific player.
This also helps servers who have a bigger player base because it saves each file individually and loads them individually instead of loading a larger file (1-5 MB large) every time the server either needs to get data or have to save data about a player. This update might improve your server's performance but it probably wont be noticeable.
Seeing as this is the first update to include this new way of saving player data so if there are any bugs then contact me (http://www.jozethdev.com/contact/) but hopefully there aren't any (any big exploits or loopholes).